"Open the app" is a common phrase in Engpsh that means to start or activate an apppcation on a computer or mobile device. The term "app" is short for "apppcation," which refers to software that performs specific tasks or functions on a device.

This phrase has its origin in the rise of smartphone technology and the increasing popularity of mobile apps. As people started using smartphones and tablets more and more, they needed a concise way to describe the process of accessing and using these small software programs.

Examples of the phrase in use include:

"Can you open the app and show me how it works?"
"I need to open the app and check my email."

中文翻译：

"Can you open the app and show me how it works?"：你能不能打开这个应用程序并告诉我它是如何工作的？
"I need to open the app and check my email."：我需要打开应用程序，查看我的电子邮件。